1912, exceptional and complete set of the construction plan of the military airship P4 built in Vigna di Valle in 1912, of the semi-rigid type Crocco-Verduzio, length 63 meters, diameter 12 meters, volume 4700 mc, two Fiat engines of 80 hp each operating a propeller, cruising speed 60 km/h. Assigned to Cantiere Dirigibili di Campalto, under the command of Captain Valle, took part in war operations in the Adriatic, carrying out numerous bombings in Pula, Muggia and Trieste. In August 1915 it was used as a pilot school for the Regia Marina.
Further unique construction plan of the military airship P 5, of the semi-rigid type Crocco-Verduzio, 4400 mc, two Fiat engines of 180 hp each allowing a cruising speed of 60 km/h. Assigned to Regio Esercito di Campalto, under the command of Captain Seymandini, withdrew from the operational line in 1915. The lot includes large boards with dozens of folded drawings. Unique and of great interest, the plans could be used to rebuild the entire aircraft, almost a twin of P4. Great rarity of the Italian and World Airships.